glcd(pcd8544)

glcd(pcd8544) - 7. Liquid Crystal Display [PCD8544] The...

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7. Liquid Crystal Display [PCD8544] The PCD8544 is a low power CMOS LCD controller/driver, designed to drive a graphic display of 48 rows and 84 columns. All necessary functions for the display are provided in a single chip, including on-chip generation of LCD supply and bias voltages, resulting in a minimum of external components and low power consumption. The PCD8544 interfaces to micro controllers through a serial bus interface. The PCD8544 is manufactured in n-well CMOS technology. As in recent years the LCD is finding widespread use replacing LED thisis due to the following reasons: The declining prices of LCD The ability to display numbers, characters and graphics. This is in contrast to LED, which are limited to numbers and a few characters. Incorporation refreshing controller into the LCD, there by the easy relieving the CPU of the task of refreshing the LCD. In contrast, the CPU, to keep the data displaying, must refresh the LED. Ease of programming for characters and graphics. 7.1. FEATURES: Single chip LCD controller/driver 48 row, 84 column outputs Display data RAM 48 ´ 84 bits On-chip: Generation of LCD supply voltage (external supply also possible)
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Generation of intermediate LCD bias voltages Oscillator requires no external components (external clock also possible). External RES (reset) input pin Serial interface maximum 4.0 Mbits/s CMOS compatible inputs Mux rate: 48 Logic supply voltage range VDD to VSS: 2.7 to 3.3 V Display supply voltage range VLCD to VSS 6.0 to 8.5 V with LCD voltage internally generated (voltage generator enabled) 6.0 to 9.0 V with LCD voltage externally supplied (voltage generator switched-off). Low power consumption, suitable for battery operated systems Temperature compensation of VLCD Temperature range: -25 to +70 °C. BLOCK DIAGRAM :
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Figure7.1 Block Diagram of Graphical LCD 7.2. FUNCTIONAL DESCRIPTION OF GRAPHICAL LCD
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7.2.1 Oscillator The on-chip oscillator provides the clock signal for the display system. No external components are required and the OSC input must be connected to VDD. An external clock signal, if used, is connected to this input. 7.2.2 Address Counter (AC)
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This note was uploaded on 02/13/2011 for the course EE 426 taught by Professor Dr.c.d.naidu during the Spring '09 term at SUNY Buffalo.

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glcd(pcd8544) - 7. Liquid Crystal Display [PCD8544] The...

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